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Related Concept Videos

Cross-bridge Cycle01:26

Cross-bridge Cycle

As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
Myasthenia Gravis ll: Pathophysiology01:22

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The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...

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Related Experiment Video

Updated: Jun 10, 2026

Real-Time Fluorescent Measurement of Synaptic Functions in Models of Amyotrophic Lateral Sclerosis
08:59

Real-Time Fluorescent Measurement of Synaptic Functions in Models of Amyotrophic Lateral Sclerosis

Published on: July 16, 2021

[Amyotrophic lateral sclerosis].

J H Veldink1, J Weikamp, H J Schelhaas

  • 1Afdeling Neurologie van het Universitair Medisch Centrum Utrecht. j.h.veldink@umcutrecht.nl

Nederlands Tijdschrift Voor Tandheelkunde
|August 24, 2010
PubMed
Summary

Amyotrophic lateral sclerosis (ALS) is a severe neurological disease causing progressive muscle weakness and respiratory failure. Current treatments focus on supportive care and riluzole to manage symptoms and improve quality of life.

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Real-Time Fluorescent Measurement of Synaptic Functions in Models of Amyotrophic Lateral Sclerosis
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Published on: July 29, 2007

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07:43

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Published on: January 7, 2019

Area of Science:

  • Neurology
  • Neurodegenerative Diseases

Context:

  • Amyotrophic lateral sclerosis (ALS) is a severe, disabling neurological disorder.
  • It causes progressive muscle weakening affecting arms, legs, face, and trunk.
  • The disease has an insidious onset, often beginning with limb or speech difficulties.

Purpose:

  • To describe the characteristics of Amyotrophic Lateral Sclerosis (ALS).
  • To highlight the diagnostic challenges and current treatment limitations for ALS.
  • To emphasize the focus on supportive care and quality of life enhancement in ALS management.

Summary:

  • ALS leads to progressive muscle atrophy and respiratory failure, with an average survival of 3 years.
  • Diagnosis is made by excluding other conditions, as no specific diagnostic test exists.
  • Riluzole is the only drug that can inhibit disease progression to some extent.

Impact:

  • Approximately 400 new ALS cases are diagnosed annually in the Netherlands.
  • Current management strategies prioritize supportive measures to optimize patient quality of life.
  • The lack of a definitive diagnostic test and limited therapeutic options underscore the need for further research.